Battery pack and liquid cooling energy storage system

Abstract

The utility model relates to a battery pack and a liquid cooling energy storage system, and belongs to the field of lithium ion energy storage, the battery pack comprises a bottom cold plate and a battery module arranged on the bottom cold plate, the top of the battery module is connected with a module total positive copper bar output and a module total negative copper bar output, the module total positive copper bar output and the module total negative copper bar output extend to the bottom cold plate through one side of the battery module, and the bottom cold plate is provided with a copper bar supporting seat for connecting the module total positive copper bar output and the module total negative copper bar output. According to the utility model, the weight of the battery pack is effectively reduced, the manufacturing cost is obviously reduced, and the same function effect as the traditional scheme is maintained. Besides, the liquid cooling energy storage system adopts a multi-cabin design, so that the battery pack with larger capacity can be accommodated, the space required by the electrical parts and the auxiliary protection unit is saved, the cost of the energy storage system is greatly reduced, and the optimization of cost effectiveness is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery energy storage, more particularly to a novel liquid cooling energy storage system device. BACKGROUND

[0002] With the continuous development of energy storage technology, especially the wide application of lithium batteries and supercapacitors and other energy storage devices, the cost problem of the energy storage system has become a key factor affecting its performance, safety and service life. In particular in commercial energy storage devices, the cost and production efficiency problems are particularly significant.

[0003] At present, the energy storage system generally uses battery packs assembled by battery cells, and then packs these battery packs into containers to form an energy storage system. This system has been widely used in the field of energy storage, but it has some shortcomings:

[0004] 1. Weight problem: The traditional metal panel and upper cover are relatively heavy in weight, especially in projects that need to pack battery packs into containers for transportation, the weight of the panel, upper cover and electrical components increases the total weight of the system.

[0005] 2. Limited heat conduction performance of cold plate: Although the cold plate of metal material has good heat conduction performance, its heat dissipation effect still needs to be improved when running at high power.

[0006] 3. Structural complexity: The existing battery pack and liquid cooling system design is complex, difficult to install and maintain, and requires a large number of screws to connect the upper cover, panel and bottom cold plate.

[0007] 4. Cost problem: The upper cover and panel cold plate of the battery pack need to be manufactured with molds, especially the upper cover size is large, resulting in high mold opening cost.

[0008] 5. Low production efficiency: The energy storage system needs to pack the battery pack into the container after the battery pack is assembled, and the assembly process of the battery pack is complex, which needs to be assembled into a battery module first, and then into a battery pack, which reduces the production and assembly efficiency. UTILITY MODEL CONTENTS

[0009] The utility model aims to provide a battery pack and a liquid cooling energy storage system device to simplify the structure, reduce the cost, improve the heat dissipation efficiency, reduce the weight, and improve the production efficiency.

[0010] In order to achieve the above object, the technical scheme of the utility model provides a kind of battery pack, battery pack includes bottom cold plate and be arranged on the bottom cold plate battery module, the battery module top is connected with module total positive copper bar output and module total negative copper bar output, the module total positive copper bar output and the module total negative copper bar output extend to the bottom cold plate by one side of the battery module, the bottom cold plate is equipped with copper bar support seat for connecting the module total positive copper bar output and the module total negative copper bar output.

[0011] Preferably, the copper bar support seat bottom is provided with a protruding limiting structure, and the end portion of the bottom cold plate is provided with a groove limiting structure matched with the protruding limiting structure.

[0012] Preferably, the copper bar support seat is provided with a copper bar support seat cover at the connection position of the module total positive copper bar output and the module total negative copper bar output.

[0013] Preferably, mica cotton sheets are arranged between the battery modules adjacent to each other.

[0014] Preferably, the battery module includes a plurality of neatly arranged battery cells, long end plates arranged on both sides of the battery cells, and steel straps fixedly connecting the battery cells and the long end plates.

[0015] Preferably, the long end plates are fixedly connected with the bottom cold plate by long screws.

[0016] The technical scheme of the utility model further provides a liquid-cooled energy storage system, which comprises a cabin, a plurality of battery packs are arranged in the cabin from top to bottom, a cluster-level total negative output copper bar is connected between the module total negative copper bar output of the battery pack located at the top and the module total positive copper bar output of the battery pack located at the bottom.

[0017] Preferably, a high-voltage box is arranged below the battery pack located at the bottom in the cabin, the module total negative copper bar output of the battery pack located at the bottom is connected to the high-voltage box through the cluster-level total negative output copper bar, and a cluster-level total positive output copper bar is connected between the module total positive copper bar output of the battery pack located at the top and the high-voltage box.

[0018] Preferably, the cluster-level total positive output copper bar is connected to the high-voltage box along the side edge of the cabin from the battery pack located at the top.

[0019] Preferably, an air conditioner is arranged above the battery pack located at the top in the cabin.

[0020] In summary, the utility model includes the following beneficial technical effects:

[0021] The battery pack of the utility model realizes a plurality of technical advantages compared with traditional battery pack through a series of innovative design. Firstly, through canceling the upper cover, the panel and the electrical parts, and reserving the flow passage design of the bottom cold plate, the weight of the battery pack is reduced, the manufacturing cost is reduced obviously, and the same functional effect as the traditional scheme is maintained. The battery pack is put into the cabin system in sequence, the cabins are isolated by mica cotton sheet, the top joint is waterproof controlled through welding technology, the cabins are also sealed, and the overall waterproofness and dustproofness are ensured. The multi-cabin design can accommodate larger capacity battery pack, and saves the space required by the electrical parts and auxiliary protection unit.

[0022] In addition, on the basis of traditional bottom heat dissipation, the cabin air conditioning air cooling heat dissipation is increased, the heat dissipation efficiency is effectively improved, the service life of the battery pack is prolonged, and the safety is enhanced. The structure of the battery pack is simplified, the main components are simplified into the bottom cold plate, the battery cell and the CCS aluminum bar, the battery cell is directly assembled on the battery pack cold plate, and the CTP (cell to Pack) structure is formed, which not only reduces the complexity of the battery pack, but also improves the production efficiency. The simplified design of the novel battery pack also greatly reduces the cost of the energy storage system, and realizes the optimization of cost benefit. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front structure schematic view of a battery pack and a liquid-cooled energy storage system in the utility model;

[0024] Figure 2 It is a structure schematic view of a battery pack in the utility model of a battery pack and a liquid-cooled energy storage system;

[0025] Figure 3 It is an assembly schematic view of a battery pack in the utility model of a battery pack and a liquid-cooled energy storage system;

[0026] Figure 4 It is a structure schematic view of module total positive copper bar output and module total negative copper bar output in the utility model of a battery pack and a liquid-cooled energy storage system;

[0027] Figure 5 It is a structure schematic view of a battery module in the utility model of a battery pack and a liquid-cooled energy storage system;

[0028] Figure 6 It is a structure schematic view of a copper bar support seat in the utility model of a battery pack and a liquid-cooled energy storage system.

[0029] Reference signs: 1, bottom cold plate water inlet; 2, bottom cold plate water outlet; 3, copper bar support seat; 4, copper bar support seat cover; 5, module total negative copper bar output; 6, module total positive copper bar output; 7, mica cotton sheet; 8, cabin one; 9, cabin two; 10, cabin three; 11, cabin four; 12, cabin five; 13, cabin six; 14, air conditioner; 15, cluster level total positive output copper bar; 16, cluster level total negative output copper bar; 17, high pressure box; 18, steel cable tie; 19, long end plate; 20, long screw; 21, CCS aluminum bar. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] The utility model embodiment discloses a kind of battery pack and liquid-cooled energy storage system, and its design aims at improving the heat dissipation efficiency, safety and economy of battery pack.The system device adopts multi-cabin structure, and each cabin is an independent sealed space, and waterproof, dustproof and safety are realized by the sealing design of cabin level. Multiple cabins are arranged from left to right inside, and each cabin top and bottom are respectively provided with air conditioner 14 and high pressure box 17, and multiple battery packs are arranged between air conditioner 14 and high pressure box 17.

[0032] Each battery pack is mainly composed of bottom cold plate, battery module located on bottom cold plate and mica cotton sheet 7 covered on battery module. Bottom cold plate internal flow passage is designed as serpentine pipe flow passage, and bottom cold plate water inlet 1 and bottom cold plate water outlet 2 are arranged at the same end for discharging the main heat of battery pack. The battery cells in the battery module are arranged in order, and the module is formed by two long end plates 19 and steel cable ties 18, and the module is installed in the nut of bottom cold plate through long end plate 19 hole and long screw 20. The top of battery module is connected with module total positive copper bar output 6 and module total negative copper bar output 5, and the two copper bar outputs extend from the top of battery module to the end of bottom cold plate through the same side of battery module, and are fixed on bottom cold plate by copper bar support seat 3, so as to facilitate integrated connection. Copper bar support seat cover 4 is covered on copper bar support seat 3 and is fixed by screw, to protect the lock screw position of the connection between module total positive copper bar output 6 and module total negative copper bar output 5 and copper bar support seat 3 and the exposed part of copper bar. The bottom of copper bar support seat 3 is designed with protruding limiting structure, and the end of bottom cold plate is correspondingly provided with recess limiting structure, to ensure that copper bar support seat 3 can be positioned on bottom cold plate, and the inside of copper bar support seat cover 4 is recessed, to avoid screw and exposed part of copper bar.

[0033] Mica cotton sheet 7 on top of the battery pack can isolate sundries and other items, enhancing safety. The main function of air conditioner 14 is dehumidification, while assisting in air cooling of the battery pack, which is automatically controlled by the battery management system according to the internal temperature of the battery pack to determine the start of air conditioner 14, rather than continuous operation. The battery packs at the top and bottom of the cabin are precisely guided to the air duct position of each battery pack by optimizing the air outlet position and structural device of air conditioner 14.

[0034] Compared with the traditional battery pack, the battery pack of the utility model cancels the upper cover, panel and electrical components, and maintains the flow channel design of the bottom cold plate. The manufactured battery pack is sequentially placed in the cabin system, and the cabins are isolated by sealing elements. The cabin waterproof control top joint adopts welding, and the cabins also adopt sealing design, which ensures waterproofness and dustproofness through welding, sealing glue and sealing rubber strip. The battery pack connection in the cabin adopts cluster-level total positive output copper bar 15 and cluster-level total negative output copper bar 16, which are sequentially connected to each battery pack.

[0035] Module total negative copper bar output 5 and module total positive copper bar output 6 are installed on copper bar support seat 3, and copper bar support seat cover 4 covers the lock screw position and the exposed part of the copper bar, so as to ensure that the copper bar is not exposed. The copper bar itself is wrapped with silica gel, and only the lock screw of the connecting part is exposed. The module total negative copper bar output 5 of the battery pack located at the upper part is connected to the module total positive copper bar output 6 of the battery pack located at the lower part through cluster-level total negative output copper bar 16, the module total negative copper bar output 5 of the battery pack located at the bottom is connected to high-voltage box 17 through cluster-level total negative output copper bar 16, and the module total positive copper bar output 6 of the battery pack located at the top is connected to high-voltage box 17 through a long copper bar (i.e. cluster-level total positive output copper bar 15) from the top of the cabin along the side of the cabin.

[0036] Cooling liquid enters from the water inlet of the bottom cold plate and takes away most of the heat. Air conditioner 14 at the top of each cabin is independently turned on to provide air cooling for cabin one 8 to cabin six 13. In a single battery pack, the battery module is fixed by long end plate 19 and steel cable tie 18, and the top is covered with mica cotton sheet 7 to block sundries. In addition to gathering cluster-level total positive and total negative, high-voltage box 17 also provides protection functions such as overcurrent, overdischarge and overcharge of the battery pack in this design.

[0037] Compared with the traditional scheme, the utility model can place more battery packs in 20 feet container. Through the multi-chamber design, larger capacity battery packs can be accommodated, and the space required for electrical components and auxiliary protection units is saved. The scheme adopts the battery pack design without upper cover, panel and electrical components, which can realize the same functional effect as the traditional scheme. By canceling the upper cover, panel and electrical components of the battery pack, the utility model significantly reduces the weight of the battery pack and greatly reduces the cost. Even if these components are canceled, the battery pack can still realize all functions.

[0038] Compared with the traditional only bottom heat dissipation, the scheme also increases the cabin air conditioner 14 air cooling heat dissipation, improves the heat dissipation efficiency, prolongs the service life of the battery pack, and enhances the safety. The battery pack structure is simplified, and the main components are only the bottom cold plate, the battery cell and the CCS aluminum bar 21, the battery cell is directly assembled on the battery pack cold plate to form the CTP (cell to Pack) structure, which effectively reduces the complexity of the battery pack and improves the production efficiency. The simplified design of the new battery pack also greatly reduces the cost of the energy storage system.

[0039] Finally, it should be pointed out that: the above-mentioned is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises a bottom cold plate and a battery module arranged on the bottom cold plate, the top of the battery module is connected with a module total positive copper bar output (6) and a module total negative copper bar output (5), the module total positive copper bar output (6) and the module total negative copper bar output (5) extend to the bottom cold plate through one side of the battery module, and the bottom cold plate is provided with a copper bar support seat (3) for connecting the module total positive copper bar output (6) and the module total negative copper bar output (5).

2. The battery pack of claim 1, wherein, The bottom of the copper bar support seat (3) is provided with a protruding limiting structure, and the end of the bottom cold plate is provided with a groove limiting structure matched with the protruding limiting structure.

3. The battery pack of claim 1, wherein, The copper bar support seat (3) is provided with a copper bar support seat cover (4) at the connection position of the module total positive copper bar output (6) and the module total negative copper bar output (5).

4. The battery pack of claim 1, wherein, Mica cotton sheets (7) are arranged between the battery modules adjacent to each other in the up-down direction.

5. The battery pack of claim 1, wherein, The battery module comprises a plurality of battery cells arranged in an orderly manner, long end plates (19) arranged on both sides of the battery cells, and steel strapping (18) for fixedly connecting the battery cells and the long end plates (19).

6. The battery pack of claim 5, wherein, The long end plates (19) are fixedly connected with long screws (20) and the bottom cold plate.

7. A liquid-cooled energy storage system, characterized by, The cabin is internally provided with a plurality of battery packs as claimed in any one of claims 1-6 from top to bottom, a cluster level total negative output copper bar (16) is connected between the module total negative copper bar output (5) of the battery pack located at the top and the module total positive copper bar output (6) of the battery pack located at the bottom.

8. The liquid-cooled energy storage system of claim 7, wherein, The cabin is internally provided with a high-pressure box (17) below the battery pack located at the bottom, the module total negative copper bar output (5) of the battery pack located at the bottom is connected to the high-pressure box (17) through the cluster level total negative output copper bar (16), and a cluster level total positive output copper bar (15) is connected between the module total positive copper bar output (6) of the battery pack located at the top and the high-pressure box (17).

9. The liquid-cooled energy storage system of claim 8, wherein, The cluster level total positive output copper bar (15) is connected to the high-pressure box (17) along the side of the cabin from the battery pack located at the top.

10. The liquid-cooled energy storage system of claim 7, wherein, The cabin is internally provided with an air conditioner (14) above the battery pack located at the top.

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